mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
46 lines
2.6 KiB
C
46 lines
2.6 KiB
C
|
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
||
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
||
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
|
|
│ Copyright 2023 Justine Alexandra Roberts Tunney │
|
||
|
|
│ │
|
||
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
||
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
||
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
||
|
|
│ │
|
||
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
||
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
||
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
||
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
||
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
||
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
||
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
||
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
||
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
|
|
#include "libc/calls/internal.h"
|
||
|
|
#include "libc/intrin/atomic.h"
|
||
|
|
#include "libc/limits.h"
|
||
|
|
#include "libc/macros.internal.h"
|
||
|
|
#include "libc/nt/accounting.h"
|
||
|
|
|
||
|
|
static uint32_t __kmp32(const void *buf, size_t size) {
|
||
|
|
size_t i;
|
||
|
|
uint32_t h;
|
||
|
|
const uint32_t kPhiPrime = 0x9e3779b1;
|
||
|
|
const unsigned char *p = (const unsigned char *)buf;
|
||
|
|
for (h = i = 0; i < size; i++) h = (p[i] + h) * kPhiPrime;
|
||
|
|
return h;
|
||
|
|
}
|
||
|
|
|
||
|
|
textwindows uint32_t __synthesize_uid(void) {
|
||
|
|
char16_t buf[257];
|
||
|
|
static atomic_uint uid;
|
||
|
|
uint32_t tmp, size = ARRAYLEN(buf);
|
||
|
|
if (!(tmp = atomic_load_explicit(&uid, memory_order_acquire))) {
|
||
|
|
GetUserName(&buf, &size);
|
||
|
|
tmp = __kmp32(buf, size >> 1) & INT_MAX;
|
||
|
|
if (!tmp) ++tmp;
|
||
|
|
atomic_store_explicit(&uid, tmp, memory_order_release);
|
||
|
|
}
|
||
|
|
return tmp;
|
||
|
|
}
|